Unregulated
Power Supply
Group 5: Balajadia, Ballestra, Buisan, Castuera, Marduquio, Sabroso
Analog IC Design
Measured Output Voltages
Challenges Encountered
Schematic Diagram Error
AC to DC Converter - Discussion 01
Why are the measured output voltages are greater
than the expected output voltage for each range?
Many factors may affect the output voltage of the power supply. One factor
may be the Ripple Voltage since unregulated power supply often have
higher level of Ripple Voltage on the output.
Ripple Voltage is the AC voltage superimposed on the top of the DC output.
This can cause the measured voltage to peak above the average voltage.
Why are the measured output voltages are greater
than the expected output voltage for each range?
Voltage Fluctuations, unregulated power
supplies rely on the input voltage they
receive from the main power source.
If the input voltage surpasses the
standard rating, the output voltage will be
superimposed with this higher voltage.
What are the faults you’ve
encountered while constructing the
power supply?
LED not working
Rotary switch not working
Wrong Voltage Reading
LED and Rotary
switch:
NONFUNCTIONAL
WHAT DID WE DO?
The LED’s malfunction is a result of an incorrect connection. Specifically, the LED
failed to function because its negative terminal was linked to the transformer’s 0
WITH THE HELP OF YOUR TEACHER OR CARER,
volts.
It should
be connected
to the
terminal
of theTHE
capacitor.
TEST
WHETHER
YOUR
SUGGESTIONS
ANDnegative
DRAWINGS
WILL MAKE
BULB LIGHT USING
ACTUAL BATTERIES, A SMALL LIGHTBULB, AND WIRES.
The LED’s positive terminal was connected to the transformer’s 3 volts. It should
be in line with the positive terminal of the capacitor to have a DC output.
Wrong
Voltage
Reading
WITH THE HELP OF YOUR TEACHER OR CARER,
TEST WHETHER YOUR SUGGESTIONS AND
DRAWINGS WILL MAKE THE BULB LIGHT USING
ACTUAL
BATTERIES,
A SMALL
LIGHTBULB, AND
The
Multimeter
is
WIRES.
registering an excessively
high voltage. The LED was
operational, at first we
assumed that the correct
output was AC, however it
should have been DC.
Schematic Diagram Error
Corrective Action
The schematic diagram provided by the manufacturer shows the LED’s negative
Lead is linked to the 0 volt point, while the positive Lead is connected to 3 volts of
the transformer. The connection is incorrect and gives inaccurate output value. The
LED should be connected to the capacitor to gain the correct DC output voltage.
Another error is seen among the internal components with a Resistor. It should be
integrated into the LED circuit to prevent burnout.
END